Related Clues:

• A fanatic or over-enthusiastic person
• Fanatic person, much too enthusiastic
• Fervent, perhaps militant, proponent
• A fanatic, driven person
• One behaves wildly or with excessive enthusiasm
• 'Almond or cashew, say (3)'
• Single-minded supporter of a cause
• Insane person
• One might be wanting to be one
• Well, it doesn't sound this way
• How one gets noise by the yard from this little bird
• A hard case for 1 down
• The case is hard for one by a washer
• Screwy enough to turn the big vessel over
• Screwy and round the bend